Barcode distribution

I suspect that there are numerous perception-driven variables that produce distributions that resemble a barcode i.e. a graph with multiple peaks.

A couple the come to mind:

• wealth (x-axis) vs happiness (y-axis)
• intelligence (x-axis) vs perception that human potential for intelligence roughly equivalent been people

This is as a result of subjective experience of the independent variable, to do with society's tendency to group people according to the independent variable, which affects group that the individual interacts with and compares him/herself with.